There are a number of problems with this person's behavior. 1) Letting an incorrect configuration persist without either notifying the team or manager is irres

There are a number of problems with this person's behavior. 1) Letting an incorrect configuration persist without either notifying the team or manager is irresponsible (and, no, her "chat" wasn't informing the manager; if anything the writing indicates it was deliberately light on information as part of her "ruse"). 2) Engaging in a passive-aggressive experiment to "prove" laziness is demoralizing and hostile. 3) Failing to address a co-worker's concerns (however poorly or inappropriately articulated) about documentation by helping him over his issue or updating the docs is itself lazy and irresponsible. This person passed an opportunity to exercise leadership by setting an example and act as a member of a team and instead chose to be aggressive and hostile toward her co-workers. If I were her manager I'd have dinged her in the performance review, possibly worse than she was dinged.